How to pronounce“tharsus”in English

here is a province called tharsus and tharsus is a large volcanic region it

takes up about a quarter of the surface area of the planet both tharsus and the Southern Highlands are shown by high topography but if you could look beneath

a map of Mars what we then do is we're going to remove this tharsus region from topography and you can now trace the dichotomy boundary right across through